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100 lines
4.0 KiB
100 lines
4.0 KiB
/**
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* Digital Voice Modem - Host Software
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* GPLv2 Open Source. Use is subject to license terms.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* @package DVM / Host Software
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*
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*/
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//
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// Based on code from the MMDVMHost project. (https://github.com/g4klx/MMDVMHost)
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// Licensed under the GPLv2 License (https://opensource.org/licenses/GPL-2.0)
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//
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/*
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* Copyright (C) 2005, 2006, 2008, 2009 Free Software Foundation, Inc.
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* Copyright (C) 2011,2015,2016 by Jonathan Naylor G4KLX
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#if !defined(__SHA256_H__)
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#define __SHA256_H__
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#include "Defines.h"
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#include <cstdint>
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namespace edac
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{
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// ---------------------------------------------------------------------------
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// Constants
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// ---------------------------------------------------------------------------
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enum {
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SHA256_DIGEST_SIZE = 256 / 8
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};
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// ---------------------------------------------------------------------------
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// Class Declaration
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// Implements SHA-256 hashing.
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// ---------------------------------------------------------------------------
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class HOST_SW_API SHA256 {
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public:
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/// <summary>Initializes a new instance of the SHA256 class.</summary>
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SHA256();
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/// <summary>Finalizes a instance of the SHA256 class.</summary>
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~SHA256();
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/// <summary>Starting with the result of former calls of this function (or the initialization
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/// function update the context for the next LEN bytes starting at BUFFER. It is necessary
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/// that LEN is a multiple of 64!!!</summary>
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void processBlock(const uint8_t* buffer, uint32_t len);
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/// <summary>Starting with the result of former calls of this function (or the initialization
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/// function update the context for the next LEN bytes starting at BUFFER. It is NOT required
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/// that LEN is a multiple of 64.</summary>
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void processBytes(const uint8_t* buffer, uint32_t len);
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/// <summary>Process the remaining bytes in the bufferand put result from context in first 32
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/// bytes following buffer. The result is always in little endian byte order, so that a byte-wise
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/// output yields to the wanted ASCII representation of the message digest.</summary>
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uint8_t* finish(uint8_t* buffer);
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/// <summary>Put result from context in first 32 bytes following buffer. The result is always
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/// in little endian byte order, so that a byte - wise output yields to the wanted ASCII
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/// representation of the message digest.</summary>
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uint8_t* read(uint8_t* buffer);
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/// <summary>Compute SHA256 message digest for the length bytes beginning at buffer. The result
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/// is always in little endian byte order, so that a byte-wise output yields to the wanted ASCII
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/// representation of the message digest.</summary>
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uint8_t* buffer(const uint8_t* buffer, uint32_t len, uint8_t* resblock);
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private:
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uint32_t* m_state;
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uint32_t* m_total;
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uint32_t m_buflen;
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uint32_t* m_buffer;
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/// <summary></summary>
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void init();
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/// <summary>Process the remaining bytes in the internal buffer and the usual prolog according to
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/// the standard and write the result to the buffer.</summary>
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void conclude();
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};
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} // namespace edac
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#endif // __SHA256_H__
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